Date of Award

Summer 2014

Degree Type


Degree Name

Master of Science (MS)


Electrical and Computer Engineering

First Advisor

Mark R. Bell

Committee Member 1

James V. Krogmeier

Committee Member 2

Stanislaw H. Zak


In this thesis the performance of three estimators, (center of gravity, template matching and maximum likelihood (MLE)) to estimate the center of the beam on a photoemissive receiver array in a Free Space Optics (FSO) system, is compared in terms of mean square error. Simulations have been conducted in Matlab by generating a two dimensional nonhomogeneous Poisson process, and, mean square error is computed for three estimators. The cases of continuous and discrete arrays are also considered for various levels of signal-to-noise (SNR) ratio. Simulations have shown that the MLE gives the least mean squared error and especially performs significantly better than other estimators under poor SNR conditions.